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Endothelial cell damage following crystalloid cardioplegic solution infusion. Scanning electron microscope study of
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Crystalloid cardioplegic solutions can damage the endothelium in coronary bypass grafts and aorta. Studies show these solutions cause endothelial cells to vanish, leaving collagen exposed, impacting graft integrity.
Area of Science:
- Cardiovascular Surgery
- Vascular Biology
- Microscopy
Background:
- Coronary artery bypass grafting (CABG) is a common surgical procedure.
- The integrity of vascular grafts is crucial for successful outcomes.
- Cardioplegic solutions are used to protect the heart during surgery.
Purpose of the Study:
- To investigate the effect of crystalloid cardioplegic solutions on the endothelium of coronary bypass grafts and aorta.
- To compare the structural integrity of endothelial cells exposed and unexposed to cardioplegic solutions.
Main Methods:
- Scanning electron microscopy (SEM) was used to examine graft and aortic tissues.
- Tissues were obtained during routine CABG operations.
- Samples included vein grafts and aortic segments above and below the cross-clamp site.
Main Results:
- Vein grafts showed normal endothelial structure after distention with blood.
- Exposure to crystalloid cardioplegic solution resulted in near-complete loss of endothelial cells in vein grafts.
- Aortic samples below the cross-clamp site exhibited endothelial damage similar to vein grafts.
- Aortic samples above the cross-clamp site maintained normal endothelium.
Conclusions:
- Crystalloid cardioplegic solutions can cause significant endothelial damage to both vein grafts and the aorta.
- This damage may compromise the long-term patency and function of coronary bypass grafts.
- Further research into alternative cardioplegic solutions or protective strategies is warranted.
Abstract:
Scanning electron microscope studies of coronary bypass grafts were carried out in six routine bypass operations. Infusion of the initial crystalloid cardioplegic medium into the aortic root after aortic cross clamping was performed in every case. In two cases, pieces of aorta below and above the cross-clamped site, le, having and not having had contact with the crystalloid cardioplegic medium, were studied. The endothelial lining of the veins showed normal structure following distention with blood. Following infusion with a crystalloid cardioplegic solution, the endothelial cells had almost completely vanished and the flow surface was composed mainly of collagen fibers. The aortic samples taken from below the cross-clamp site showed similar destruction of the endothelium that was observed in vein grafts after crystalloid cardioplegic solution infusion, whereas the aortic samples taken from above the cross-clamp site disclosed normal endothelium.